1
2
Motor protection alarm: This is often caused by a broken (main) fuse in the property.
1. Check fuses, replace if necessary.
2. Set the heat pump to operating mode OFF and confirm, to reset alarm.
3. Set the heat pump to operating mode AUTO.
If the problem persists, contact your installer as the motor protection may need a manual reset.
Overheat protection alarm: May be caused by air/low pressure in the heating circuit or no
flow.
1. Check pressure in heating circuit and bleed air from the heating system if required. (See
description in regular checks chapter.) If required, fill up to recommended pressure.
2. Set the heat pump to operating mode OFF and confirm.
3. Turn off the electric main supply to the heat pump and then carefully remove the front of
the heat pump using a flat screw driver on the top locking mechanism. Fold the front
carefully forward and lift it off (be careful with the display cable).
4. Reset the overheating protection by pressing the button (quite hard) in the left corner.
See picture, T1 is overheat protection.
5. Re-fit the heat pump front and then turn on the electrical supply again. Turn on electric
main supply.
6. Set the heat pump to operating mode AUTO
bar
1.0
1.5
0.5
2.0
0
2.5
High pressure alarm: Check system pressure (see description in regular checks). Also check
that any thermostats on radiators & floor heating are open, and vent heating system for air.
1. Set the heat pump to operating mode OFF and confirm to reset alarm.
2. Check system pressure (see description in regular checks). Also check that any thermo-
stats on radiators and floor heating are open, and vent heating system for air.
3. Set the heat pump to operating mode AUTO.
4. If the alarm goes off again, set the heat pump to operating mode auxiliary heater (to get
hot water) and contact your installer.
Low pressure alarm: Usually caused by air or no flow in the brine circuit.
1. Check the brine level in the vessel (must not be empty, should normally be ~2/3 full). If
the fluid level is too high or low, contact your installer if you are uncertain how and with
what to fill.
2. If the brine level is ok, reset the alarm ONCE. If the alarm goes off again, set the heat
pump to operating mode auxiliary heater and contact your installer.
For any alarms re-occurring, please contact your installer for advice.
User Guide
Thermia Legend
Thermia AB
BWLE01UG0102
19
